﻿

/// <summary>  
/// 类说明：Assistant  
/// 编 码 人：苏飞  
/// 联系方式：361983679    
/// 更新网站：http://www.sufeinet.com/thread-655-1-1.html  
/// </summary>  
using System;  
using System.Collections.Generic;  
using System.Text;  
using System.Data;  
using System.Reflection;  
using System.Collections;  
using System.Data.Common;  
  
namespace SpiderLib
{  
    //JSON转换类  
    public class ConvertJson  
    {  
        #region 私有方法  
        /// <summary>  
        /// 过滤特殊字符  
        /// </summary>  
        private static string String2Json(String s)  
        {  
            StringBuilder sb = new StringBuilder();  
            for (int i = 0; i < s.Length; i++)  
            {  
                char c = s.ToCharArray()[i];  
                switch (c)  
                {  
                    case '\"':  
                        sb.Append("\\\""); break;  
                    case '\\':  
                        sb.Append("\\\\"); break;  
                    case '/':  
                        sb.Append("\\/"); break;  
                    case '\b':  
                        sb.Append("\\b"); break;  
                    case '\f':  
                        sb.Append("\\f"); break;  
                    case '\n':  
                        sb.Append("\\n"); break;  
                    case '\r':  
                        sb.Append("\\r"); break;  
                    case '\t':  
                        sb.Append("\\t"); break;  
                    default:  
                        sb.Append(c); break;  
                }  
            }  
            return sb.ToString();  
        }  
  
        /// <summary>  
        /// 格式化字符型、日期型、布尔型  
        /// </summary>  
        private static string StringFormat(string str, Type type)  
        {  
            if (type == typeof(string))  
            {  
                str = String2Json(str);  
                str = "\"" + str + "\"";  
            }  
            else if (type == typeof(DateTime))  
            {  
                str = "\"" + str + "\"";  
            }  
            else if (type == typeof(bool))  
            {  
                str = str.ToLower();  
            }  
            else if (type != typeof(string) && string.IsNullOrEmpty(str))  
            {  
                str = "\"" + str + "\"";  
            }  
            return str;  
        }  
        #endregion  
 
        #region List转换成Json  
        /// <summary>  
        /// List转换成Json  
        /// </summary>  
        public static string ListToJson<T>(IList<T> list)  
        {  
            object obj = list[0];  
            return ListToJson<T>(list, obj.GetType().Name);  
        }  
  
        /// <summary>  
        /// List转换成Json   
        /// </summary>  
        public static string ListToJson<T>(IList<T> list, string jsonName)  
        {  
            StringBuilder Json = new StringBuilder();  
            if (string.IsNullOrEmpty(jsonName)) jsonName = list[0].GetType().Name;  
            Json.Append("{\"" + jsonName + "\":[");  
            if (list.Count > 0)  
            {  
                for (int i = 0; i < list.Count; i++)  
                {  
                    T obj = Activator.CreateInstance<T>();  
                    PropertyInfo[] pi = obj.GetType().GetProperties();  
                    Json.Append("{");  
                    for (int j = 0; j < pi.Length; j++)  
                    {  
                        Type type = pi[j].GetValue(list[i], null).GetType();  
                        Json.Append("\"" + pi[j].Name.ToString() + "\":" + StringFormat(pi[j].GetValue(list[i], null).ToString(), type));  
  
                        if (j < pi.Length - 1)  
                        {  
                            Json.Append(",");  
                        }  
                    }  
                    Json.Append("}");  
                    if (i < list.Count - 1)  
                    {  
                        Json.Append(",");  
                    }  
                }  
            }  
            Json.Append("]}");  
            return Json.ToString();  
        }  
        #endregion  
 
        #region 对象转换为Json  
        /// <summary>   
        /// 对象转换为Json   
        /// </summary>   
        /// <param name="jsonObject">对象</param>   
        /// <returns>Json字符串</returns>   
        public static string ToJson(object jsonObject)  
        {  
            string jsonString = "{";  
            PropertyInfo[] propertyInfo = jsonObject.GetType().GetProperties();  
            for (int i = 0; i < propertyInfo.Length; i++)  
            {  
                object objectValue = propertyInfo[i].GetGetMethod().Invoke(jsonObject, null);  
                string value = string.Empty;  
                if (objectValue is DateTime || objectValue is Guid || objectValue is TimeSpan)  
                {  
                    value = "'" + objectValue.ToString() + "'";  
                }  
                else if (objectValue is string)  
                {  
                    value = "'" + ToJson(objectValue.ToString()) + "'";  
                }  
                else if (objectValue is IEnumerable)  
                {  
                    value = ToJson((IEnumerable)objectValue);  
                }  
                else  
                {  
                    value = ToJson(objectValue.ToString());  
                }  
                jsonString += "\"" + ToJson(propertyInfo[i].Name) + "\":" + value + ",";  
            }  
            jsonString.Remove(jsonString.Length - 1, jsonString.Length);  
            return jsonString + "}";  
        }  
        #endregion  
 
        #region 对象集合转换Json  
        /// <summary>   
        /// 对象集合转换Json   
        /// </summary>   
        /// <param name="array">集合对象</param>   
        /// <returns>Json字符串</returns>   
        public static string ToJson(IEnumerable array)  
        {  
            string jsonString = "[";  
            foreach (object item in array)  
            {  
                jsonString += ToJson(item) + ",";  
            }  
            jsonString.Remove(jsonString.Length - 1, jsonString.Length);  
            return jsonString + "]";  
        }  
        #endregion  
 
        #region 普通集合转换Json  
        /// <summary>   
        /// 普通集合转换Json   
        /// </summary>   
        /// <param name="array">集合对象</param>   
        /// <returns>Json字符串</returns>   
        public static string ToArrayString(IEnumerable array)  
        {  
            string jsonString = "[";  
            foreach (object item in array)  
            {  
                jsonString = ToJson(item.ToString()) + ",";  
            }  
            jsonString.Remove(jsonString.Length - 1, jsonString.Length);  
            return jsonString + "]";  
        }  
        #endregion  
 
        #region  DataSet转换为Json  
        /// <summary>   
        /// DataSet转换为Json   
        /// </summary>   
        /// <param name="dataSet">DataSet对象</param>   
        /// <returns>Json字符串</returns>   
        public static string ToJson(DataSet dataSet)  
        {  
            string jsonString = "{";  
            foreach (DataTable table in dataSet.Tables)  
            {  
                jsonString += "\"" + table.TableName + "\":" + ToJson(table) + ",";  
            }  
            jsonString = jsonString.TrimEnd(',');  
            return jsonString + "}";  
        }  
        #endregion  
 
        #region Datatable转换为Json  
        /// <summary>   
        /// Datatable转换为Json   
        /// </summary>   
        /// <param name="table">Datatable对象</param>   
        /// <returns>Json字符串</returns>   
        public static string ToJson(DataTable dt)  
        {  
            StringBuilder jsonString = new StringBuilder();  
            jsonString.Append("[");  
            DataRowCollection drc = dt.Rows;  
            for (int i = 0; i < drc.Count; i++)  
            {  
                jsonString.Append("{");  
                for (int j = 0; j < dt.Columns.Count; j++)  
                {  
                    string strKey = dt.Columns[j].ColumnName;  
                    string strValue = drc[i][j].ToString();  
                    Type type = dt.Columns[j].DataType;  
                    jsonString.Append("\"" + strKey + "\":");  
                    strValue = StringFormat(strValue, type);  
                    if (j < dt.Columns.Count - 1)  
                    {  
                        jsonString.Append(strValue + ",");  
                    }  
                    else  
                    {  
                        jsonString.Append(strValue);  
                    }  
                }  
                jsonString.Append("},");  
            }  
            jsonString.Remove(jsonString.Length - 1, 1);  
            jsonString.Append("]");  
            return jsonString.ToString();  
        }  
  
        /// <summary>  
        /// DataTable转换为Json   
        /// </summary>  
        public static string ToJson(DataTable dt, string jsonName)  
        {  
            StringBuilder Json = new StringBuilder();  
            if (string.IsNullOrEmpty(jsonName)) jsonName = dt.TableName;  
            Json.Append("{\"" + jsonName + "\":[");  
            if (dt.Rows.Count > 0)  
            {  
                for (int i = 0; i < dt.Rows.Count; i++)  
                {  
                    Json.Append("{");  
                    for (int j = 0; j < dt.Columns.Count; j++)  
                    {  
                        Type type = dt.Rows[i][j].GetType();  
                        Json.Append("\"" + dt.Columns[j].ColumnName.ToString() + "\":" + StringFormat(dt.Rows[i][j].ToString(), type));  
                        if (j < dt.Columns.Count - 1)  
                        {  
                            Json.Append(",");  
                        }  
                    }  
                    Json.Append("}");  
                    if (i < dt.Rows.Count - 1)  
                    {  
                        Json.Append(",");  
                    }  
                }  
            }  
            Json.Append("]}");  
            return Json.ToString();  
        }  
        #endregion  
 
        #region DataReader转换为Json  
        /// <summary>   
        /// DataReader转换为Json   
        /// </summary>   
        /// <param name="dataReader">DataReader对象</param>   
        /// <returns>Json字符串</returns>   
        public static string ToJson(DbDataReader dataReader)  
        {  
            StringBuilder jsonString = new StringBuilder();  
            jsonString.Append("[");  
            while (dataReader.Read())  
            {  
                jsonString.Append("{");  
                for (int i = 0; i < dataReader.FieldCount; i++)  
                {  
                    Type type = dataReader.GetFieldType(i);  
                    string strKey = dataReader.GetName(i);  
                    string strValue = dataReader[i].ToString();  
                    jsonString.Append("\"" + strKey + "\":");  
                    strValue = StringFormat(strValue, type);  
                    if (i < dataReader.FieldCount - 1)  
                    {  
                        jsonString.Append(strValue + ",");  
                    }  
                    else  
                    {  
                        jsonString.Append(strValue);  
                    }  
                }  
                jsonString.Append("},");  
            }  
            dataReader.Close();  
            jsonString.Remove(jsonString.Length - 1, 1);  
            jsonString.Append("]");  
            return jsonString.ToString();  
        }  
        #endregion  
    }  
}  